Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: qual é a equipe da cfl onde a faculdade é waterloo?
 ###Tabelas: CREATE TABLE exhibition_schedule (exhibition_schedule_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Home Team VARCHAR, Score VARCHAR, Visiting Team VARCHAR, Stadium VARCHAR) CREATE TABLE top_appearances_in_uefa_club_competitions (top_appearances_in_uefa_club_competitions_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Player VARCHAR, Games INT, Goals INT, Goal Ratio INT, Debut in Europe INT) CREATE TABLE fencing (fencing_id AUTO_INCREMENT PRIMARY KEY, Athlete VARCHAR, Event VARCHAR, Semifinal VARCHAR, Final VARCHAR, Rank VARCHAR) CREATE TABLE round_four (round_four_id AUTO_INCREMENT PRIMARY KEY, Pick # INT, CFL Team VARCHAR, Player VARCHAR, Position VARCHAR, College VARCHAR) CREATE TABLE united_kingdom_channel_4 (united_kingdom_channel_4_id AUTO_INCREMENT PRIMARY KEY, Episode number INT, Title VARCHAR, Original airing on Channel 4 VARCHAR, Time of airing on Channel 4 VARCHAR, Original airing on E4 VARCHAR, Time of airing on E4 VARCHAR, Position in Channel 4s ratings a VARCHAR, Position in E4s ratings b VARCHAR, Total viewers VARCHAR)  
SELECT COUNT CFL Team FROM round_four WHERE College = Waterloo